We are not going to laugh, but some may offer constructive advice based on their experience.
If it makes you feel any better I am running a loop designed for a completely different case that I am not yet finished. It looks hilarious imo but boy does it work a treat.
To purge remaining air from the rad I had to hang it sideways with zipties and tip the rad around every now and then. It took a few days but pretty sure I got all of the air out now.

Just remember that looks are not everything and you have to start somewhere. If your loop fits into your case nicely, and nothing has exploded/leaked yet you are at least on the right track!